The Acer 23.QFJN2.001 CPU fan is a replacement part for the processor cooling assembly in the Acer Nitro AN517-55. Acer’s parts list identifies this exact part number as the CPU fan and separates it from the VGA fan, which has a different part number.
Use this fan as a CPU cooling component for the listed Nitro model. Its role is to help move heat away from the processor during computer operation. The reference matters when identifying the part: 23.QFJN2.001 is the CPU fan, while 23.QFJN2.002 is listed separately for VGA cooling.